<div id="test2">
    这里是2.html
    <div data-bind="text:showdata">

    </div>
    <a href="#/3">to 3html</a>
    <script type="text/javascript" src="./jquery.min.js"></script>
    <script type="text/javascript" src="./knockout-3.3.0.js"></script>
    <script type="text/javascript" src="./2.js"></script>
</div>